Burglar-alarm



(No MndeL.)

J. GQNEWELL.

' BURGLAVR ALARM. i Y No. 325,961. Patented Sept; 8, 1885.

UNITED STATES PATENT OFFICE. I

JOHN G. NEWELL, OF NEW HAVEN, CONNECTICUT.

BURGLARTALARIVI.

SPECIFICATION forming part of Letters Patent No. 325,961, dated September 8, 1885.

Application filed February 9, 1885.' (No niodeL i .To all whom, it may concern:

Be itknown that I, JOHN G. N EWELL, of New Haven, in the county of New Haven and State of Connecticut, have invented a new Im provement in Burglar-Alarms; and I do hereby declare the following, when taken in connection with accompanying drawings,and the letters of reference marked thereon, to be a full, clear, and exact description ofthe saine, and which said drawings constitute part of this specification, and represent, in-

Figure 1, a perspective View of the alarm full size; Fig. 2, a transverse section through a door and its jamb, showing the alarm as applied;.Fig. 3, a vertical central section enlarged.

This invention relates to the construction of a device to be attached near a door or other opening, whereby when the door, or whatever it may be that closes the opening is opened or moved an alarm will be sounded; and the invention consists in the construction hereinafter described, and more particularly recited in the claim.

A represents a tube, to one end of which a cap, B, is screwed, and to the other end a similar, cap, C. In the tube a spindle, D, is arranged to work freelongitudinally. At one end the tail E of the spindle extends out through the cap C, the tail of the spindle being of less diameter than the body ot' the spindle, and so as to form a shoulder, a, thereon.

Between the shoulder and the cap, through which the tail passes, a spiral spring, F, is in troduced around the tailhand so that one end rests against the cap and the other on the shoulder, the tendency or action of the spring being to force the spindle toward the opposite end of the tube into the cap B.

In one side of the tube aslot, b, is formed, through which projects a linger, G, from the spindle, and so that the spindle may be moved longitudinally in the tube by means of the inger G serving as a handle for that purpose. At the end of the slot b next the spring a transverse slot, d, is cut, and so that the spindle may be forced against its spring and compress the spring, andwhen so compressed the linger be turned into the notch d, as in Fig. 3, and so as to hold the spindle in that position.

The cap Bis removable for the insertion of a percussion pellet, the pellet being indicated at e, Fig. 3. The cap replaced serves-as an anvil, so that when the spindle shall be turned, to bring the linger into line with the slot, the spring will forciby drive the spindle toward the anvil or cap B, and crush the pellet, producing an explosion,which will give an alarm.

The tubeis provided with athin sharp blade, H, which maybe forced into the jamb near a door, as seen in Fig. it may be a screwshank to be driven into the jamb, as in Fig. 2.

The alarm is applied to the jamb near the door, I, Fig. 2, representing the jamb, and L the door. The finger G, when turned into its 2 5 or, instead of a blade,`

notch, stands in the path of the opening door,

and so that as the door is opened it must strike the nger, and in so doing will throw the nger into the slot, leaving the spindle free,and so that the spindle may be discharged to produce the explosion. Then, when it is desired to reset the alarm, a new pellet is applied, and the spindle drawn its cocked position, which brings the linger into `the position seen in Fig. 2, and again in the path of the opening door. y

This device is so small as to be conveniently carried in the pocket for the use of travelers and others, Fig. 1 representing the device in full size, and having formed its office in one place it may readily be removed and retained for use in another place, the blade or screw making the device readily attachable or detachable wherever the alarm may be desired.

' The representation ofthe alarm as applied to a door-jamb will be sufticient to enable those desiring the use of such an alarm to apply it to windows, or wherever a temporarilyclosed opening is required to be protected.

and caught at' been applied and pery In order that a slight rotation only may be A necessary for the spindle to take the finger G out of the path of the door, I make the slot b diagonal, inclining away from the notch d and away from the door, and so that as the spindle moves in the cylinder the spiral slot, acting upon the inger,will give to the spindle apartial rotation, and thus throw the finger farther around than when it left the notch d,- but roo the slot may be parallel with the axis of the tube.

The alarm may be applied as a permanent attachment. Vhere it is desired, however, to so attach it, I prefer to omit the blade or shank, and apply ears to the cylinder, as in dieated in Fig. 3, through which screws may be introduced to secure it.

I am aware that an alarm consisting of a tube, with a spindle-like handle therein, and a finger extending from the hammer through an L-shaped slot in the tube, is a well-known device; but this I do not claim, the essential feature of my invention being the diagonal or spiral slot which extends from the transverse notch d, and whereby the longitudinal movement of the hammer under the action of the spring imparts to the hammer a rotary move A turned transversely at its end to form a notch,

d, the spindle D, arranged in the cylinder for free longitudinal movement, spring F in the cylinder adapted to force the spindle toward the removable cap, the said spindle provided with a linger, G, extending through the said 3o slot, the said tube constructed for attachment substantially as described.

JOHN G. NEVELL. Vitiiesses:

Jos. G. EARLE, J. I-I. SHUMwAY. 

